Senior Backend Software Engineer

Auctane•Austin, TX

10d•Hybrid

About The Position

At Auctane, we are united by a passion to help businesses deliver — whatever their size, wherever they are, and however they operate. We make it possible for businesses to meet the ever-changing requirements of their industry and customer expectations. Auctane products enable hundreds of thousands of businesses to annually mail and ship billions of items — over $200 billion worth — to recipients around the globe. The Auctane family of mailing and shipping software products includes ShipStation, Stamps.com, ShipStation API, Metapack, GlobalPost, and Packlink. Our partners include Amazon, UPS, USPS, eBay, BigCommerce, Shopify, WooCommerce, and Walmart. We're seeking an experienced Senior Backend Engineer to join our engineering team. In this role, you'll architect and build scalable backend systems that power our applications, working across our modern tech stack to deliver robust, high-performance solutions. This position is focused on the Stamps.com brand. This position is hybrid (3 days per week in office) and is located in Austin, TX.

Requirements

Strong proficiency in .NET, including ASP.NET Core, Entity Framework Core, and building RESTful APIs. Experience with C# design patterns and async programming
Hands-on experience deploying and managing services on AWS, including EC2, Lambda, RDS, S3, CloudFront, SQS and API Gateway. Familiarity with infrastructure as code (Terraform, CloudFormation or CDK)
Some experience with front-end JavaScript component libraries such as React.
Strong understanding of database design (both SQL and NoSQL)
Experience with containerization (Docker) and orchestration
Knowledge of authentication/authorization patterns (OAuth, JWT)
Understanding of microservices architecture and distributed systems
Proficiency with Git and CI/CD pipelines
Experience with monitoring, logging, and performance optimization
5+ years of backend development experience
Bachelor’s Degree in Computer Science
Proven track record of building and scaling production applications
Strong problem-solving abilities and attention to detail
Experience mentoring junior developers
Demonstrated ability to use AI tools responsibly to enhance productivity

Nice To Haves

TypeScript
Experience with event-driven architectures and message queues
Knowledge of caching strategies (Redis, CDN)
Background in DevOps practice
Experience integrating AI capabilities into applications (OpenAI API, Claude API, or AWS Bedrock)

Responsibilities

Architect, build, and maintain scalable, robust backend services and microservices using C# and .NET.
Create and consume secure REST APIs for seamless communication between backend services and front-end/mobile applications.
Design, query, and optimize relational databases (both SQL and NoSQL).
Conduct rigorous code reviews, enforce engineering standards, and write clean, maintainable, production-ready code.
Provide technical guidance, support, and mentorship to mid-level and junior developers.
Collaborate with the infrastructure team to configure CI/CD pipelines, deploy applications to the cloud (AWS), and maintain different environments.
Develop and maintain unit tests and integration tests to ensure application reliability.

Benefits

Flex Time Off policy
12 paid holidays
401k employer matching program
Annual merit reviews
Company events
Attractive office space in the heart of central Austin, Texas (free drinks, snacks…)
Weekly catered lunches at our office
Medical, dental, and vision plans
Fitness center in the office with Tonal Mirrors, Pelotons, free weights, etc.
Employee Assistance Program (up to 8 free mental health sessions)
Gym discounts
Education reimbursement
Employee Referral Program
Inclusive, casual and upbeat work environment